Pillager patrols are still spawning in trees in 1.14.4. This affects both standard pillagers and captains. It looks like they are spawning on solid blocks in the trees, and are ignoring the leaves when spawning, rather than spawning on the leaves themselves. 

How to reproduce: Play the game. After a while, pillager patrols will spawn, and occasionally will spawn in trees. I live in a jungle and it's extremely obvious this happens, and very annoying when I'm getting shot from trees that I have to break to get to the pillager. 

It's clear other people are still having this issue:

https://www.reddit.com/r/Minecraft/search?q=pillager+tree&restrict_sr=on

I updated MC-142360, and the mod told me to create a new ticket, so here it is. 

This happens in single player, and on a server, both using Spigot software and Paper, as well as the vanilla server.